Study Bava Kamma folio 69B with parallel Hebrew-English text, traditional commentary, and modern study tools. Free access to Babylonian Talmud online.
Text Excerpt
הלוקח יין מבין הכותים, אומר: שני לוגין שאני עתיד להפריש – הרי הן תרומה; עשרה מעשר ראשון; תשעה מעשר שני; ומיחל ושותה מיד, דברי רבי מאיר.
In the case of one who purchases wine from among the Samaritans [Kutim], if there is reason to suspect that teruma and tithes were not separated, and he cannot separate them before the start of Shabbat, he acts as follows. If there are 100 log of wine in the jugs, he says: Two log that I will separate in the future are teruma, as the mandated average measure of teruma is 1/50th; 10 log are first tithe; and a tenth of the remainder, 9 log, are second tithe. And he desacralizes the second tithe that he will separate in the future by transferring its sanctity onto money, and he may drink the wine immediately, relying on the separation that he will perform later. This is the statement of R' Meir.
רבי יהודה ורבי יוסי ורבי שמעון אוסרין.
R' Yehuda, R' Yosei, and R' Shimon prohibit one from doing so. The objection of these 3 rabbis is presumably that this arrangement relies on the principle of retroactive designation, as at the time of the declaration the identity of the particular portions of wine that will be teruma and tithes is unknown, and these rabbis do not accept this principle. It is apparent from this Mishnah that R' Yehuda does not accept retroactive designation, and therefore he cannot be the one who said that the owner of the field may issue his declaration of relinquishment in the morning.
אמרי: סוף סוף, אמאי קא אפכת לה למתניתין – משום דקשיא דרבי יהודה אדרבי יהודה; השתא נמי – קשיא דרבי יוחנן אדרבי יוחנן,
The Talmud says: Ultimately, why do you reverse the baraita that contains the opinions of R' Yehuda and R' Dosa? It is because there is a difficulty due to the contradiction between one statement of R' Yehuda and another statement of R' Yehuda. Now too, although you have reversed the baraita, a similar problem remains, as there is a difficulty due to the contradiction between one statement of R' Yoḥanan and another statement of R' Yoḥanan.